/Engine/Source/Runtime/RHI/Public/PipelineFileCache.h
Open the user pipeline file cache for the specified name and platform. The user cache is always created even if the file was not present when opened. Name is the name used when opening the file, the key value for the user cache is held within UserCacheName. returns true if the file was opened.
static bool OpenUserPipelineFileCache ( const [FString](API\Runtime\Core\Containers\FString) & Key, const [FString](API\Runtime\Core\Containers\FString) & CacheName, EShaderPlatform Platform, [FGuid](API\Runtime\Core\Misc\FGuid) & OutGameFileGuid )